Abrading machine



Nov, 28, 1944.

C. W. DRAKE ABRADING MACHINE Filed April 3, 1943 2 Sheets-Sheet 1 feg y ill/20 www Ma.,

w. DRAKE ABRADING MACHINE Filed rApril s, 194s 2 Sheets-Sheet 2 Patented Nov. 28, 1944 f UNITED? STATE s PATENT optics 2,363,436! a l f ABRADI'NG MACHINE v l Charles Warren Drake, Kirkwood,-Mo., assigner to f l' McDonnell Aircraft Corporation, St. Louis, Mo.,

' 'a corporation of Maryland t i. Appuc'atian April s, 1943, serial 10,481,668

" s claims. co1. -1-143) invention relatesfto abrading machines.

The invention has for its principalobject to devise an abrading machine that will produce open or closed bevels whose slant or inclination may be changed duringthe beveling operation, that willindicate the angle of the open or closed bevel for which .the device is set, that will permit the angle of the bevelto be Vvaried or evenreversed during the beveling operation without adjusting the work relativeto the supporting table therefor and without stopping the abrasiver machine, and

that willprovide a seat for the loperator andper.

mit the angle,- of the bevelV to be controlled by theA operators' feet. The invention consistsrin the abrading machine and in the construction, combinations and arrangements of parts hereinafter described and claimed.- f In the accompanying drawings which form part of this Aspecificationand wherein like lsymbols refer tolike parts wherever,l they occur, Fig. l is ya fragmentary side elevational view of `an ab-rading machine embodying my invention,

Fig. 2 isaffrontelevational View of said'machine, with the jlower portion thereofy shown broken away and with ther operators seatA omitted,

The table tilting mechanismcomprises a hori` zontal-shaft ,9 journaled in a pedestal bearing I0 xed to the floor below the front edgeof the table. kThershaft, 9 is providedatits opposite endswith crank arms II having pedals I2 fixed tothe free endsV thereof. The operator occupies a seat I3 located in front of said tableand applies his feet to the pedals I2 to rotatesaid shaft in either direction. As shown in Fig. 1, the vseat I3 is ofthe bicycle type and is mounted for verticaladjustment in a supporting post I4 fixed Fig. 3 is an enlarged fragmentary horizontal section on thefline 3--3 in Fig. 1,

Fig. 4 is an enlarged fragmentary side eleva-l tional view yof the machine in the region of the` yright-hand rear corner portion of the work supporting table; and Y v Fig. 5 is afragmentary line E-EinFi' 1.

My abrading machine comprises afnabrading table. The table 3 has lugs B, 6a depending from the underside thereof that. are aperturedy to receive the supporting shaftE 4I therefor. The shaft 4 is. supported atone end ina bearing 'l fixed to bracket or arm 8 that projects forwardly from the corresponding side of the framework 2; and said shaft is-supported near its opposite end in a bearing la mounted on the front end of a supporting rod 8a that projectsforwardly from the corresponding side of said framework.

vertical vsection on' the to the floor. The rshaft 9 is provided with a sprocket pinion I5 which has a sprocket chain connection I6 with a sprocket wheel Il fixed to a horizontal shaft I8 located below the front portion ofthe table l.parallel with the table supportf ing shaft 4. This sprocket driven shaft I3 is journaled at its opposite ends in suitable bearings I9, ISa, the ebearing I 9 being rigidly. secured to the supporting bracket 8 for the table shaft bearing l andthe bearing [9a being rigid with the table shaft-bearing la.;

One end of*r thev shaft I8 yis-provided with a bevelp'inion I Ba that intermeshes with and drives a bevel gear 20 fixed lto a horizontal shaft 2| disposed transverse to the shaft I8. The shaft 2| is journaled in suitable bearings 22 provided therefor on a brackety 23 fixed to the right-hand bearing la forthe table supporting shaft 4. The shaft 2l is provided'between its supporting bearf ings 22 with a worm 24 which meshes with a sector worm gear 25 fixed to a plate 26 that deT pends from and is rigidly secured to the adjacent right-hand end of the table 3. By this arranger ment, the pedal shaft 9 may be rotated in either direction by the operator to tilt the .table 3 about the axis of its supporting shaft 4 and thus raise f or lower the `rear edge 5 thereof relative to the abrasive'element B, depending on the direction of rotation of said pedal shaft.

The .framework 2 of the-machine' is provided above the level ofthe, table 3 withvmechanism 'for indicatingY the particular angle at whichl said table is set. This indicating mechanism com-l prises anvupright slide bar 2lmounted for vertical slidingmovement in a dove-tail-slideway 28 provided therefor in the front face of the frontfiange of'an upright angle membervl29 whosev rearfiange is suitably secured to vthe right-hand side of the framework 2. 'I'he vertically movable slide member 21 terminates at its lower end in a forwardly projecting flange or shoe 30 that seats oni the ball-shaped free end 3Ia of the horizontal portion of an L-shaped rod 3l whose vertical portion is adjustably secured by nuts 32 to an arm 33 fixed to the depending plate 26 on the right-hand end of the table 3. The slide bar 21 is yieldably held down on the supporting ball 3|a therefor preferably by means of a coil tension spring 34 having its upper end secured to the ball engaging shoe 30 of said slide bar and its other end anchored to a bracket 35 xed to the right-hand framework 2.

The slide bar 21 terminates above the level of the table 3 in a rigid horizontal arm 36 that is disposed in front of the belt l clear of the work@ ing surface thereof and terminates at its free end in a vertically disposed rack 31. The raok'31 intermeshes with a pinion 38 journaled on a hori-v zontal stud 39 that is fixed to and projects rear-` wardly from the front flange of an angle bracket bracket 40 is a circular dial 42 which is secured to said pinion for rotation therewithpreferably by means of a nut 43. The dial has a forwardly and outwardly inclined rim flange 44 whose inner peripheral surface is circumferentially graduated, as at 46, from zero to forty-five degrees on opposite sides of the zero graduation. A pointer 41 is rigidily secured to the front flange of the stud supporting bracket 4D and extends downwardly therefrom with its lower end in position to cooperate With the graduated surface 46 of the rim 44 of the rotary dial 42.

The gear ratio of the table tilting mejchanism is such that for each revolution of the pedal shaft' 9, the table 3 will be tilted a definite number of degrees and the connection between the table and the rotary dial 42 is such that the vpointer will indicate when the table isin a horizontal position and the angular position of the table when the rear edgethereof is raised to produce a closed bevel or lowered to produce an open bevel. In operation, the operator occupies the seat I3 in front of the tablej'3, the work (not shown) is placed on the table and held against the belt l by theoperators hands, and the pedal shaft 9 is operated by the operators feet until the dial 42 indicates the angle of the surface that is to be beveled. If an open angle is desired,` the pedal shaft is rotated in one direction and if a'closed angle is desired, the pedal shaft is rotated in the opposite direction. The rotary movement of the pedal shaft 9 is transmitted through the sprocket chain I6 to the shaft I8, thence through the bevel pinion [8a and gear 26 to the intermeshing worm 24 and worm sector gear 25, thereby rotating thetable 3 about the axis of its supporting shaft A4. This rotary'or tilting movement of the table 3 raises or lowers the rear edge thereof and the L-shaped ball carrying arm rod 3| xed thereto, thereby imparting a corresponding movement to the vertical slide bar 21 and the rack arm 36 fixed thereto and thus rotating the pinion 38 and the dial 42 carried thereby relative to the pointer 41, which cooperates with the graduations 46 on the dial to indicate the angular setting of the table for either open or closed bevels.

'I'he hereinbefore described arrangement provides a seat for the operator and enables the table to be adjusted by the feet for both open or closed angles up to forty-,five degrees, while the operators hands are free for use in holding work down on the table and against the abrasive belt. An important advantage of the present machine is that it makes it possible to produce a bevel which may be varied or even reversed Without lifting the work from the table or without stopping the abrasive machine or the beveling operation ,to change the angle of the bevel, In other words, an open bevel may be started at one end of the work piece and may be changed to a closed bevel at the other end thereof in one continuous beveling operation.

The hereinbefore described invention admits of considerable modification. Therefore, I do not Wish to be limited to the precise arrangements shown and described.

What I claim is:

1. A beveling machine comprising a vertically moving abrading belt, a table mounted for tilting movement on a horizontal axis disposed substantially parallel with the working face of said ibelt, foot controlled -means for tilting said table on said 'axis including a pedal actuated shaft, a shaft driven thereby, and a worm and worm gear connection between said last mentioned shaft and said table, and means for indicating the angular position of said table, said indicating means including a ro-tary dial responsive to the tilting movement of said table and a stationary pointer cooperating with said dial.

2. A beveling machine comprising a vertically moving abrading belt, a table mounted for tilting movement on a horizontal axis disposed substantially parallel with the working face of said belt, foot controlled means for tilting said table on said axis, and means for indicating the angular position of said table, said indicating mechanism comprising a vertically reciprocable member responsive to the tilting movement of said table, a rack carried by said member, a pinion intermeshing with and actuatedA by said rack, a

dial rotatable with said pinion and a fixed pointer cooperating with said dial.

3. A beveling machine comprising a vertically moving abrading belt, a table mounted for tilting movement on a horizontal axis disposed substantially parallel withthe working face of said belt, foot controlled means for tilting said table on said axis, and means for 'indicating the angular position of said table, said foot controlled table tilting means including a sector worm gear xed to said tableconcentric with said horizontal axis, a worm intermeshing with said gear, and a pedal actuatedy shaft operatively connected to said worm rotating the same, said indicating mechanism including a vertically reciprocable member responsive tothe tilting movement of said table, a rack carried by said member, a pinion intermeshing with and actuated by said rack, a dial rotatable with said pinion and a xed pointer cooperating lwith said dial.

' CHARLES WARREN BRAKE. 

